CN105450190B

CN105450190B - Electronic tube power amplifier circuit that is single-ended and recommending double structure

Info

Publication number: CN105450190B
Application number: CN201410503302.0A
Authority: CN
Inventors: 刘自华
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-09-26
Filing date: 2014-09-26
Publication date: 2018-11-27
Anticipated expiration: 2034-09-26
Also published as: CN105450190A

Abstract

The present invention relates to electron tube power Design of Amplification Circuit field, in particular to it is a kind of it is single-ended with recommend the electronic tube power amplifier circuit that two kinds of circuit structures can mutually switch.The amplifying circuit includes phase splitter, the first electron tube, the second electron tube, the first conversion equipment, the second conversion equipment, transformer；Phase splitter wherein signal output end connects the grid of the second electron tube by the first conversion equipment all the way, in addition signal output end is directly connected to the grid of the first electron tube all the way；The armature winding of transformer has first coil and the second coil, and the Same Name of Ends of first coil connects the screen grade of the first electron tube, and the different name end of first coil is high voltage input terminal；The Same Name of Ends of second coil, different name end are connect by the second conversion equipment with screen grade, the high voltage input terminal of the second electron tube.The circuit can make circuit free switching between single-ended structure and push-pull configuration according to different use demands, circuit structure is simple and at low cost by conversion equipments such as switch or relays.

Description

Electronic tube power amplifier circuit that is single-ended and recommending double structure

Technical field

The present invention relates to electron tube power Design of Amplification Circuit field, in particular to it is a kind of it is single-ended with recommend two kinds of circuit knots The electronic tube power amplifier circuit that structure can mutually switch.

Background technique

Electron tube is a kind of electric signal amplifier part of earliest period.It is closed in glass container（Generally glass tube）In Cathode electronics emitting portion, control grid, accelerating grid electrode, anode（Anode）Lead is welded on pin.Using electric field to true Aerial control grid injects electrical modulation signal, and obtains in anode and believe the different parameters after signal amplification or feedback oscillation Number.Early stage is applied in the electronic products such as television set, radio sound amplifier, in recent years gradually by semi-conducting material manufacturing Amplifier and integrated circuit replace, but at present in the sound appliances of some high-fidelities, still high using low noise, the coefficient of stability Electron tube be audio-frequency power amplifier part.Electron tube audio-frequency power amplifier, with its brilliant playback sound quality, by HiFi The favor of enthusiast.

Existing electron tube amplifying circuit is usually individual two kinds of circuit structures, single-end circuit structure and push-pull circuit knot Structure.It is the amplification circuit structure schematic diagram of electron tube push-pull configuration commonly used in the prior art, audio signal Vin referring to attached drawing 1 It is input to phase splitter, is divided into the two paths of signals output of opposite in phase, the grid for being sent to two electron tubes V11 and V12 respectively is defeated Enter end, positive-phase signal, negative phase signal respectively by electron tube V11, V12 amplification after, respectively by the screen of electron tube V11, V12 Grade is output to transformer T11 armature winding both ends.Transformer T11 also corresponds to the load and impedance transformation of electron tube.Usually push away The armature winding of transformer T11 in tying-in structure has a centre cap, and electron tube high voltage supply B+ enters from the centre cap, Output transformer T11 secondary windings connects speaker, for driving speaker.The advantages of push-pull configuration is output power, but sound quality It is bad.

It is the amplification circuit structure schematic diagram of electron tube single-ended structure commonly used in the prior art, audio letter referring to attached drawing 2 Number Vin is routed directly to the gate input of two electron tubes V21 and V22, and the two paths of signals of same-phase passes through electron tube V21 respectively Amplify with V22, by armature winding one end of the screen grade output connection transformer T21 of two electron tubes V21 and V22, transformer The T21 armature winding other end is the high voltage supply signal input part B+ of two electron tubes T21 and T22, i.e. change in single-ended structure Depressor T21 armature winding does not have centre cap.Transformer also corresponds to the load and impedance transformation of electron tube, transformer T21 times Grade winding connects speaker, for driving speaker.Single-ended structure advantage formula sound quality is good, but power ratio push pull configeration is much lower, About the 1/3 of push pull configeration.

Existing power pipe power amplifier only has a kind of circuit structure or is individual single-ended structure or is single Only push-pull configuration.It in use, cannot be according to using when people have different demands to good sound quality or big output power Demand flexibly to change circuit structure.

Summary of the invention

Aiming at the problem that transistor amplifier circuit in the prior art mentioned above only has a kind of circuit structure, this hair Bright to disclose electronic tube power amplifier circuit that is a kind of single-ended and recommending double structure, which can be according to different use demands in single-ended knot Free switching between structure and push-pull configuration, structure are simple and at low cost.

For solve prior art problem and the technical solution adopted is that：

Electronic tube power amplifier circuit that is single-ended and recommending double structure, it is characterised in that：Including phase splitter, the first electron tube, Second electron tube, the first conversion equipment, the second conversion equipment, transformer；

Phase splitter has signal input part and two paths of signals output end, for the electric signal of input to be converted to two-way The output signal of opposite in phase, the phase splitter wherein all the way signal output end by the first conversion equipment connection second electricity The grid of sub- pipe, the other signal output end all the way of phase splitter are directly connected to the grid of the first electron tube；

Transformer includes armature winding and secondary windings, and the armature winding has first coil and the second coil, And first coil and the second coil have Same Name of Ends and different name end, and the Same Name of Ends of first coil connects the screen of the first electron tube Grade, the different name end of first coil are high voltage input terminal；The Same Name of Ends of second coil, different name end pass through the second conversion equipment and second The screen grade of electron tube, high voltage input terminal connection.

It is preferably but not limited to, first conversion equipment is single-pole double-throw switch (SPDT) or single-pole double-throw relay.

It is preferably but not limited to, second conversion equipment is double-point double-throw switch or dpdt relay, or is two A single-pole double-throw switch (SPDT) or two single-pole double-throw relays.

Therefore it is heretofore described single-ended with the electronic tube power amplifier circuit for recommending double structure, can by switching or The conversion equipments such as relay convert circuit freely between single-ended structure and push-pull configuration, electricity Line structure is simple and at low cost.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art To obtain other drawings based on these drawings.

Fig. 1 is the electron tube amplification circuit structure schematic diagram of push-pull configuration in the prior art；

Fig. 2 is the electron tube amplification circuit structure schematic diagram of single-ended structure in the prior art；

Fig. 3 is electronic tube power amplifier electrical block diagram that is single-ended in the present invention and recommending double structure.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.

Embodiment 1：

Referring to shown in attached drawing 3 it is single-ended with recommend the electronic tube power amplifier circuit of double structure comprising phase splitter, first Electron tube V31, the second electron tube V32, the first conversion equipment SwA, the second conversion equipment SwB, transformer T31；Phase splitter band There are signal input part and two paths of signals output end, the output for the electric signal Vin of input to be converted to two-way opposite in phase is believed Number, the grid that wherein signal output end passes through first conversion equipment SwA the second electron tube of connection V32 all the way of the phase splitter Pole, the other signal output end all the way of phase splitter are directly connected to the grid of the first electron tube V31；

Transformer T31 includes armature winding and secondary windings, and the armature winding has first coil A and second Coil C, and first coil A and the second coil C have Same Name of Ends and different name end, and the Same Name of Ends connection first of first coil A The screen grade of electron tube V31, the different name end of first coil A are high voltage input terminal B+；The Same Name of Ends of second coil C, different name end pass through Second conversion equipment SwB is connect with the screen grade of second transistor V32, high voltage input terminal B+.

It is preferably but not limited to, the first conversion equipment SwA is single-pole double-throw switch (SPDT) or single-pole double-throw relay；Described Two conversion equipment SwB are double-point double-throw switch or dpdt relay, or are two single-pole double-throw switch (SPDT)s or two hilted broadswords Double-throw relay.The first conversion equipment and the second conversion equipment are retouched for switching in the specific embodiment of the present embodiment It states, but does not constitute the restriction to first conversion equipment and the second conversion equipment.

The present invention is described by taking electron tube as an example, but the first electron tube and the second electron tube can also with BJT, IGBT, MOS, MOSFET constant power element is replaced, and is not limited only to electron tube, is not constituted using the description of electron tube to the technology The restriction of scheme protection scope.

Referring to attached drawing 3, when the first conversion equipment SwA is connected to the forward signal output end of phase splitter, i.e., connect with 2 contacts When logical, the second electron tube V32 and the first electron tube V31 are all connected with the forward signal output end of phase splitter, and the second converting means Two fixed contacts for setting SwB are connect with 2 contacts of the device, i.e., the second coil C's of transformer T31 armature winding is of the same name End is connect with the screen grade of the second electron tube V32, and the different name end of the second coil C is connect with high voltage input terminal B+, and circuit works at this time In single-ended structure mode.

When the first conversion equipment SwA is connected to the reverse signal output end of phase splitter, i.e., when being connected to 1 contact, second Electron tube V32, the first electron tube V31 are separately connected the negative-going signal output end of phase splitter, forward signal output end, and second turn Two fixed contacts of changing device SwB are connect with 1 contact of the device, i.e. the second coil C's of transformer T31 armature winding Same Name of Ends is connect with high voltage input terminal B+, and the different name end of the second coil C is connect with the screen grade of the second electron tube V32, at this time circuit Work is in push-pull configuration mode.

Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode Within enclosing.

Claims

1. electronic tube power amplifier circuit that is single-ended and recommending double structure, it is characterised in that：Including phase splitter, the first electron tube, Two electron tubes, the first conversion equipment, the second conversion equipment, transformer；

Phase splitter has signal input part and two paths of signals output end, for the electric signal of input to be converted to two-way phase Opposite output signal, the phase splitter wherein all the way signal output end by the first conversion equipment connect the second electron tube Grid, phase splitter in addition all the way signal output end be directly connected to the first electron tube grid or the phase splitter The other signal output end all the way is directly connected to the grid of the first electron tube, and the grid of the second electron tube passes through described first turn Changing device is connect with the grid of first electron tube；

Transformer, includes armature winding and secondary windings, and the armature winding has first coil and the second coil, and the One coil and the second coil have Same Name of Ends and different name end, and the Same Name of Ends of first coil connects the screen grade of the first electron tube, The different name end of first coil is high voltage input terminal；The Same Name of Ends of second coil, different name end are by the second conversion equipment respectively with the Screen grade, the high voltage input terminal of two electron tubes connect or the Same Name of Ends of second coil, different name end pass through second converting means It sets and is connect respectively with the high voltage input terminal of second electron tube, screen grade.

2. electronic tube power amplifier circuit that is as described in claim 1 single-ended and recommending double structure, it is characterised in that：Described first turn It changes the outfit and is set to single-pole double-throw switch (SPDT) or single-pole double-throw relay.

3. electronic tube power amplifier circuit that is as described in claim 1 single-ended and recommending double structure, it is characterised in that：Described second turn It changes the outfit and is set to double-point double-throw switch or dpdt relay, or be two single-pole double-throw switch (SPDT)s or two single-pole double throw relays Device.